All That You Should Know About Gas Cylinder Valves

Gases constantly seek ways to escape from or enter into a gas supply system. Cylinder valves are devices that control the flow of the gases into or out of the cylinder. Pertaining to the escaping nature of gases, cylinder valves are gaining importance like never before.

What are the types available?

Packed Valves – These valves are mostly found on acetylene cylinders (B & MC) and corrosive products such as ammonia or chlorine. They typically have a specially designed wrench which has to be removed during shipping & storage.

Pressure-seal Valves – This is a common valve found on most of the cylinders and can be operated using a handwheel at very high pressure levels.

Diaphragm Valves – You can find these valves on cylinders which demand high levels of protection against leakage such as cylinders containing gas mixtures, high purity gases and rare gases such as krypton and xenon.

Post-type Medical Valves – These pin-indexed valves are used in some medical gas products to ensure supply of the right gas to a particular apparatus.

For your convenience and safety, JTC Valves maintains a well-managed inventory of cylinder valves manufactured in the USA by Sherwood and Rego, leading brands in valve manufacturing. All the valves you find here are certified by ASME & ISO 9001 certified.

JTC Valve Sales serves the market with strong, durable and high quality cylinder valves including chlorine valves, medical valves and welding cylinder valves.

You can choose a valve that serves your purpose well from the following series:

Acetylene Valves

AV Series – It is operated with a handwheel or a wrench and is used in small cylinders.

GV Series – It is precisely machined for use in large cylinders

GVT Series – These valves are designed for large cylinders and can be operated with a handwheel

Industrial Valves

GV series – Designed for applications up to 3000 psi

GVHM series – Designed for applications from 3001 to 6400 PSI

GRPV series – Designed for 3500 psi as maximum working pressure and 10,000 PSI as burst pressure

MVHM series (Monel valves) – Designed for applications with maximum working pressure of 6000 PSI and burst pressure 13,500 psi

SVHM series (Stainless steel valves) – Designed for corrosive application like salt water and chemical processing

BV series (Hi/lo valves with built-in regulators) – Designed for larger capacity 4500 PSI cylinders

Medical Cylinder Valves

GV MRI Series - Global Valves for Use in MRI Environments

KVAB Series - Post-type medical valves for “F” and “D” type cylinders and used for all CCA-860 yokes.

KVMB Series -  Post Medical Valves for Use in Magnetic Resonance Imaging (MRI) Environments

OxyGen 1 Series - Oxygen Valves with Integrated Pressure Regulators

YVBA Series - Vertical Outlet Oxygen Valves

Distinguishable features:

·         100% helium tested

·         Pressure Relief Devices to ensure excellent flow characteristics

·         Durable & tamper-resistant

·         Can be tapped for dip tube

·         Direct drive stem to reduce friction & low torque operations

·         Integrated brass valves

·         High quality assurance due to ASME & ISO 9001 certifications and automated testing processes

Safety Precautions:

·         Know the gas before using the cylinder

·         Do not lubricate the valves or apply jointing compounds & tape

·         If the valves are frozen, use warm water to thaw it

·         Use no more than three quarters of a turn to open a valve

·         Never force the valve shut

·         Strictly use recommended handwheels or keys to open valves

Visit JTC Valve Sales and place an order for a valve that fits to your requirements. We are sure you will find it in our stock. We are leading suppliers of all kinds of industrial valves.

Source : https://www.jtcvalvesales.com/blog/all-that-you-should-know-about-gas-cylinder-valves/ 

As we all know, a valve is a device that helps the user to control the flow of the gas or liquid. The valves may control the flow either automatically or manually by opening, closing or partially shutting the passageway. These mechanical devices have become an important tool in piping systems.

 

Valves are an integral part of our daily life. Valves have a wide range of domestic as well as industrial applications. There are different types of valve, some with a pressure relief device, some to be used with liquid, gases or slurries. Valves basically regulate the flow. 

Types of valves

The most common types of gas cylinder valves are ammonia, chlorine, CNG valve, ASB valves,  packed valves, valves with a diaphragm, gate valve, globe valve, line valve, fuse valve and LPG valve to list a few. All the valves have a specific design and application.

The material used to make ASB Valves

ASB Packed Valves

Various metals are used to manufacture valves:

Aluminum: resistant to corrosion, non ferrous metal with a chemical weight 1/3^rd of that of steel

Copper: excellent thermal and electrical conductivity property, corrosion resistant and highly ductile which makes it an ideal material to use for valves that function at higher temperatures

Bronze: it is the first alloy developed and widely accepted for pressure valves and fitting as it has a higher strength than copper. Easy to join and highly resistant to pit corrosion

Silicon Bronze: highly ductile, corrosion resistant and much higher resistance to stress cracking makes it an ideal material for stem in the valve manufacture

Aluminum Bronze: is widely used to make disc in butterfly valves. It is heat treatable, corrosion resistant and very strong, though cannot be used for applications with high pH

Brass: good machinability and corrosion resistant, which makes it the commonly used material for valve and stem in ball valves

Alloys of iron: these are gray iron, ductile iron, cast steel, nickel plated ductile iron, which is used to make valves that are used in pressure vessels. For bonnets, stem and bodies in gate, check or butterfly valves

ASB packed valve is made aluminum, silicon bronze valve that is used in the following applications.

•        Liquid or gas chlorine
•        Insecticides and fumigants
•    Bleaching agents

The body of the ASB packed valve is resistant to corrosive gases. You may choose a ASB Valve with a pressure relief device or without one. This depends up on your applications.

What features to look for in an ASB packed valve or a CGA valve

•          Bonnet assembly
•          Reliable dual backup ring design
•          Innovative design of the valve
•         Industrial strength
•         Reduction in stress zones

It is advisable to purchase the valves that are manufactured by well reputed companies and distributed by leading online portals like JTC Valve sales. Your safety is assured when you buy from a renowned portal as valves approved by the CGA are stocked here. Find the right ASB valve or CGA valve right here and be assured of the best quality product at most competitive rates. Click here to order now. 

Source: https://jtcvalvesales.wordpress.com/2015/12/04/asb-packed-valves

All You Need To Know About Globe Valves

Globe valves are valves with a globular body with a linear motion valve. The shape of the body has changed, though the function principle remains the same. Globe valves offer precise throttling ability for high pressure systems which is advantageous for some uses. The low flow coefficient is the biggest disadvantage for some users when the valve operating time is longer and the operator has to manually check whether the valve is completely open or closed.  Globe valves are widely used in systems that run on a wide range of temperatures, systems that require frequent stroking and vacuum.

Globe valves are used for gas as well as liquid systems. They are not advisable to be used for slurry systems as the material may become entrapped in the cavity and disable the valve operations. They can be used in a variety of applications as long as the pressure and temperature are within the limits. The space between the disk and the seat changes which allows the liquid to flow. Sometimes the direction of the flow changes which causes a change in pressure. To help maintain a tight seal, the globe valve is installed with a vertical stem and fluid stream connected to the pipe above the disk.

The globe valve is used where the flow or the pressure is to be controlled in a system. The globe valve can be operated in any position between open and close that offers precision control. This is possible due to the perpendicular movement of the disk away from the seat. The gradual change in the spacing allows the operator to precisely control the flow. 

Construction of the Globe valve

The globe valve is designed in three body types: angle design, Y-design and Z-design.  The trim consists of a disk and seat ring. The disk lowers into the seat in the center of the valve to stop the flow. The position of the disk in relation to the seat allows or restricts the flow. The handwheel and disk are connected by a stem which is threaded and fits in the valve bonnet.  The seat of the globe valve may be integrated or screwed into the body of the valve. The valve is open or closed by the valve actuator which operates the stem and disk.

Advantages of Globe Valve

• The brass globe valve is highly durable and safe
• Fast acting
• The control of flow is precise
• Can be easily used in high pressure systems

Disadvantages of Globe valves

• The opening of the disk assembly is large
• There is high head loss
• Globe valve is much heavier than other valves
• The coefficient of flow is low
• The mounting of the disk on the stem is cantilevered

Read More Here All You Need To Know About Globe Valves

Everything Deserves Attention, So Does Your Gas Cylinder Valves And Regulators

Gas cylinder valves and gas cylinder regulators are devices that provide safety and control. The gas cylinder regulator has two important functions. With the movement of the diaphragm, the vent either restricts the gas flow or moves away from it when the pressure alters. Air gets sucked in through the vent. The vent has to be clear to regulate the pressure safely. The regulator exhausts the gas when internal relief valves open.

General Maintenance guideline for gas/Cryo cylinder regulators

• Gas regulators fall into three categories as per the gas service they are used for. Corrosive, non-corrosive and mildly corrosive. If you are unable to identify the category, consult JCT Valve sales to identify the type
• Check the connections for any leak when the gas cylinder regulator is under high pressure and low pressure. If you detect a leakage, shut down the gas source immediately. Tighten the leak and if it still leaks, shut the gas source and call the expert to prevent any casualty
• Conduct a creep test which is a phenomenon when delivery pressure rises above the set point.  This tests the motion of the spring and ensures that no foreign material is lodged between the seat and the poppet which causes regulator failure
• All gas regulators should be purged to maintain the integrity of the cylinder. Purging means simply allowing an amount of gas to flow through the regulator and alternately depressurizing and pressurizing the regulator with the gas. This is done by opening and closing the regulator, and  the safety valve after each cycle. Not sure of it, contact the gas cylinder maintenance experts
• All the gas regulators should be removed periodically and inspected for proper functioning. If required, overhauling should be carried out
• Replace the gas regulator and gas valves when its life expectancy is over. This will prevent accidents and failures

The maintenance of the pressure regulators is mandatory for safety. Follow a maintenance schedule to minimize regulator failure and downtime. Always purchase gas regulators and valves that are manufactured by companies that have all the various certifications. Safety is of utmost importance. All valves should be made from the highest quality material which is brass and stainless steel as per the usage. The valves and seals play a major role in safety. 

JTC Valve sales are the leading stockiest for the best quality of valves and regulators, which are manufactured by Rego, Sherwood. These manufacturers have standard accreditions which include ISO certification, PED certificate, TPEDADR-IS inspection certificate which ensures that only the best quality raw material is used, stringent manufacturing procedures are followed and the safest valves and regulators are available at JTC Valve sales. Find everything you need in valves and regulators right here. Every penny you pay is worth your safety!

Read More here Everything Deserves Attention, So Does Your Gas Cylinder Valves And Regulators